package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;


// 注解
@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceImpl();
        String action =req.getParameter("action");
        if("list".equals(action)){
            List<User> users = userService.findAll(new User());
            req.setAttribute("users", users);
            req.getRequestDispatcher("/list.jsp").forward(req, resp);

        }else if("add".equals(action)){
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");

            int result = userService.addUser(new User(name,pass));
            if (result > 0) {
                // 重定向
                resp.sendRedirect("user?action=list");
            }

        }else if("delete".equals(action)){
            String sid = req.getParameter("id");
            Integer id = Integer.parseInt(sid);
            // 获取参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");


            int result = userService.updateUser(new User(name,pass));

            // 重定向
            resp.sendRedirect("user?action=list");
        } else if ("update".equals(action)) {
            req.setCharacterEncoding("UTF-8");

            // 获取参数
            String sid = req.getParameter("id");
            Integer id = Integer.parseInt(sid);



            User user=userService.findById(id);

            // 将对象存储于作用域中
            req.setAttribute("user",user);
            //
            req.getRequestDispatcher("/update.jsp").forward(req,resp);

            // 重定向
            resp.sendRedirect("user?action=list");

        }


        // 跳转到对应的视图显示数据
        req.getRequestDispatcher("/index.jsp").forward(req, resp);

    }
}
